config

radon# cat /etc/systemd/system/mongodb.service 
[Unit]
Description=MongoDB Server
Wants=network.target
After=network.target

[Service]
Type=simple
ExecStart=/usr/bin/mongod --config /etc/mongodb.conf
User=mongodb
Group=mongodb
Restart=always
ExecReload=/bin/kill -HUP $MAINPID
StandardOutput=syslog
StandardError=syslog

[Install]
WantedBy=multi-user.target

instanciated service

radon# cat /etc/systemd/system/[email protected] 
[Unit]
Description=dhcpcd on %I
Wants=network.target
Before=network.target

[Service]
Type=simple
ExecStart=/sbin/dhcpcd --timeout 0 --nobackground %I
Restart=always
StandardOutput=syslog
StandardError=syslog

[Install]
WantedBy=network.target

instanciated status

radon# systemctl status [email protected]
[email protected] - dhcpcd on eth0
          Loaded: loaded (/etc/systemd/system/[email protected]; disabled)
          Active: active (running) since Fri, 16 Dec 2011 01:35:57 +0100; 4 weeks and 0 days ago
        Main PID: 340 (dhcpcd)
          CGroup: name=systemd:/system/[email protected]/eth0
                  └ 340 /sbin/dhcpcd --timeout 0 --nobackground eth0
radon# 

status

radon# systemctl status mongodb.service
mongodb.service - MongoDB Server
          Loaded: loaded (/etc/systemd/system/mongodb.service; enabled)
          Active: active (running) since Fri, 13 Jan 2012 10:50:23 +0100; 2h 44min ago
        Main PID: 4766 (mongod)
          CGroup: name=systemd:/system/mongodb.service
                  └ 4766 /usr/bin/mongod --config /etc/mongodb.conf